| Autor: |
Vemula, Satya R., Porter, Patrick, Schuster, Greta L., Lewis, Brad E. |
| Zdroj: |
Texas Journal of Agriculture & Natural Resources; 2012, Vol. 25, p1-12, 12p, 1 Black and White Photograph, 5 Charts, 1 Graph, 1 Map |
| Abstrakt: |
Susceptibility levels of adult Helicoverpa zea (Boddie), collected from green bean growing areas of Texas and New Mexico using sex-pheromone baited traps, were tested against some of the most common commercial insecticides that are extensively used in green bean production. Insecticide vial bioassays indicated variation in the levels of tolerance over the season with highest LC50 values during mid-season in 2002 and 2003. Studies included three active ingredients from two insecticide classes. Zeta-cypermethrin, bifenthrin, and methomyl were tested at nine different concentrations. Data from 2002 showed a statistically significant progressive decrease in susceptibility levels between the generations that were tested with bifenthrin and methomyl. In 2003, these variations in susceptibility levels were different though not significant. Differences in bifenthrin susceptibility were substantial between the locations in the middle of the 2003 season for third generation moths. Increased insecticide use in 2002 compared to 2003 might have accounted for higher tolerance levels in 2002. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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